单项选择题

What does the phrase "vis-a`-vis" exactly mean in the first sentence of the second paragraph

A．"with a view to"
B．"in response to"
C．"in comparison with"
D．"in opposition against"
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单项选择题
The rats fed unrestricted diets do NOT ______
A．have one preventing-aging protein increased
B．have their cell death increased or doubled
C．have their DNA fragmentation doubled
D．have the levels of proteins increased
单项选择题
Which of the following statements is true, according to the passage
A．Scientists make no progress in the researches.
B．Researchers have made a great breakthrough.
C．More researches are to be made in the field.
D．The more proteins the less calories the better.
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